Grab or automatic hoisting-bucket



Patented Dac. 20, |898. J. CAMPBELL. GRAB 0B AUTOMATIC HDISTING BUCKET.

(Application led Mar. 5, 189B.)

2 Sheets-Sheet I.

(No Model.)

WITHEEEEE:

rn: cams PETERS cu. PHoTLwNo.. wAsHlNm'oN. u.c.

Na. 6|6,287. Patented Dec. 20, 1898.

J. CAMPBELL. GRAB 0R AUTOMATIC HDISTING BUCKET.

(Application led Mar. 5, 189B.)

(lhylviodel.)V 2 Sheets-Sheet 2.

VVT-1- ESEE: l \/EI TCT TH: Nnnms Pnzns co. PHoYo-LITHQ., wAsmNoToN. u.c, E

ATE-NT .IEREMIAH CAMPBELL, OF CHELSEA, MASSACHUSETTS.

GRAB OR AUTOMATIC HOISTING-BUCKET.

SPECIFICATION forming part of Letters Patent No. 616,287, dated December20, 189g.

Appnmion tied March 5, 189s.

To all whom t may concern:

Be it known that I, J EREMIAH CAMPBELL, a citizen of the United States,residing at Chelsea, in the county of Suffolk and State ofMassachusetts, have invented a new and useful Improvement in GrabsorAutomaticHoisting-Buckets, of which the following is a full, clear,and exact description, reference being had to the accompanying drawings,forminga part of this specification, in explaining its nature.

My invention relates to improvements in grabs or automatichoistingbuckets,and pertains to a grab operated by two chains or ropesand a double-drum engine.

`The object of the invention is to so construct the grab that it shallhave great spread when open and not be high when closed and to providesimple and powerful means for its operation and a rigid frame aboutwhich the operative parts Work. A

In the drawings, Figure l is a side elevation of a grab embodying myinvention, the

dotted line showing it in an open position.`

Fig. 2 is'an end elevation when closed.

Referring to the drawings, A represents the frame, about which the partsoperate, containing near its top the shaft l), upon which the sheaves ccturn. At its top is an eye d, to which the suspending or holding ropeor chain His attached. I The shells S S are hinged at s to the lowerouter ends of the frame A. Connected rigidly to the shells S by means ofthe rods E E are the levers L'L, these levers carrying at their upperends the sheaves ff.

The closing and hoisting rope C is bifurcated, one part passing throughthe top of the frame A about one of the sheaves f on the lever L, thenceover the sheave c,and over the other sheave f to the eye g, where itsend is secured. The other part passes in a similarl manner about thesheaves f' of the other lever L and the sheave c to the eye g. The shaftb is so angled that the rope or chain will lead fairly onto all thesheaves of each tackle.

Serial No. 672,764. (N modell.)

In order to operate the grab, it is suspended by the rope H, the rope Cis slackened, and the levers L L and their respective shells S S swinginto the dotted (open) position, overhauling their respective tackles.The grab is in this position lowered onto the coal or other substance tobe gathered by it. The drum which winds the rope H is thus released, andthe other drum of the hoisting-engine is operated to wind up the rope C,which exerts a pull on the tackles, and the levers and shells areoperated to close and gather in the coal or other substance. Thecontinued winding of the rope C will hoist the grab, and it is opened todischarge its load by holding the rope H and slacking the rope C, asbefore.

Having thus fully described my invention, I claim and desire to securebyLetters Patent of the United States- The grab-bucket herein described,the same having the rigid frame A shaped substantially as represented,theshells S pivoted at s to the lower ends of said frame to swingthereon as set forth, the long levers L, L rigidly attached at theirouter ends to said shells, the two sheaves f and two sheaves f at theupper or free ends of said levers, the shaft boarried by the rigid framenear its top and having the angular relation thereto set forth, thesheaves c, c upon said shaft, the suspendingrope II and bifurcatedclosing and hoisting rope C one part of which passes through the part ofthe frame A about one of the sheaves f on the lever L, thence over thesheave c and over the other sheavef to the eye g, and the other part ofwhich rope passes in a similar manner about the sheaves f of the leverL', and the sheave c to the said eye g', all as and for the purposes setforth.

JEREMIAH CAMPBELL.

IVitnesses:

F. F. RAYMOND, 2d, J. M. DoLAN.

